/Engine/Source/Runtime/InteractiveToolsFramework/Public/ToolDataVisualizer.h
Actually does the cylinder drawing
virtual void InternalDrawWireCylinder ( const FVector & Position, const FVector & Normal, float Radius, float Height, int Steps, const [FLinearColor](API\Runtime\Core\Math\FLinearColor) & Color, float LineThickness, bool bDepthTested )